Arc initiation device for phase change rock breaking device

Abstract

This application provides an arc excitation device for a phase change rock breaking device, including a detonating wire, a hollow tube, and an excitation device. The hollow tube includes an intermediate connecting section. The excitation device has a clamping ring cylinder with an annular inner cavity containing a igniter and a heating agent. The open end of the clamping ring cylinder has an annular cover. The outer wall of the intermediate connecting section has a detonating wire connection terminal. The lower end of the detonating wire passes through the inner wall of the intermediate connecting section and connects to the detonating wire connection terminal. The inner wall of the annular cover has a floating contact terminal. An ignition needle is located on the side of the annular cover near the clamping ring cylinder. The electrode is electrically connected to the floating contact terminal. The annular cover is fitted onto the outer wall of the intermediate connecting section so that the detonating wire connection terminal contacts the floating contact terminal. This solves the problem that the heating agent in a phase change excitation device must be separated from the phase change liquid and can be externally detonated.

Description

Technical Field

[0001] This utility model relates to the field of blasting construction, and in particular to an electric arc excitation device for a phase change rock breaking device. Background Technology

[0002] Accidents caused by explosive explosions occur frequently in blasting projects every year, bringing not only safety issues but also numerous environmental problems, such as rock debris and dust pollution. Compared to traditional blasting methods, non-blasting rock breaking, such as liquefied air rock breaking, offers advantages such as low noise, high safety, and low pollution. It addresses many rock breaking needs under special conditions and with limited operational constraints, while also providing good controllability and creating more opportunities for green rock breaking. However, pure liquefied air rock breaking suffers from problems such as low precision in detonation time and incomplete vaporization of liquefied air leading to poor blasting results.

[0003] To avoid the aforementioned problems, after filling an expandable storage bag or cylinder with a phase change liquid such as liquid air or liquid oxygen, a large amount of heat can be released through a chemical reaction of the exothermic agent, triggering a rapid phase change in the phase change liquid. Since the storage bag or cylinder is filled with liquid, the exothermic agent cannot be directly exposed inside the storage bag or cylinder. Therefore, there is an urgent need for a treatment scheme that can isolate the exothermic agent from the liquid and meet the external detonation conditions. Utility Model Content

[0004] This invention provides an electric arc excitation device for a phase change rock breaking device, which solves the problem that the heating agent of the phase change excitation device must be separated from the phase change liquid and can be externally detonated.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is: an arc excitation device for a phase change rock breaking device, including a detonating wire, a hollow tube, and an excitation device. The hollow tube includes an intermediate connecting section. The excitation device is provided with a clamping ring cylinder, which has an annular inner cavity containing igniter and a heating agent. The opening end of the clamping ring cylinder is provided with a ring cover. The outer wall of the intermediate connecting section is provided with a detonating wire connection terminal. The lower end of the detonating wire passes through the inner wall of the intermediate connecting section and connects to the detonating wire connection terminal. The inner wall of the ring cover is provided with a floating contact terminal. The side of the ring cover near the clamping ring cylinder is provided with an ignition needle, which has two adjacent electrodes that are electrically connected to the floating contact terminal. The ring cover is fitted onto the outer wall of the intermediate connecting section so that the detonating wire connection terminal contacts the floating contact terminal.

[0006] In the preferred embodiment, a terminal retaining spring and a sealing ring are sequentially provided on the inner side of the floating contact terminal inside the ring cover.

[0007] In a preferred embodiment, the ring cover has two concentrically arranged annular recessed grooves on one side, each containing a conductive ring. The ring cover also has a notched recessed groove, with a through terminal hole on the inner side wall of the notched recessed groove. A floating contact terminal, a terminal retaining spring, and a sealing ring are disposed within the terminal hole. A connecting wire is also provided, with one end of the connecting wire connected to the floating contact terminal and the other end passing through the sealing ring to connect to the conductive ring. One end of each electrode is connected to the conductive ring.

[0008] In the preferred embodiment, the ring cover has two glue-filling channels near the inner wall, the outer wall of the middle connecting section has a sinking part, the detonator connection terminal is located in the sinking part, the side wall of the sinking part has two glue-filling holes, and the middle connecting section is sleeved with the ring cover so that the glue-filling channels and glue-filling holes are closed and connected to the sinking part.

[0009] In the preferred embodiment, an AC power supply, a switching power supply module, a drive module, a transformer, and a rectifier module are electrically connected. The two ends of the detonating wire are connected to the rectifier module and the ignition needle, respectively, and a current-limiting resistor is connected in series on the detonating wire.

[0010] In the preferred embodiment, a current-limiting resistor is connected in series on the detonation line.

[0011] In a preferred embodiment, the ignition needle also includes an H-shaped attitude retainer, in which two electrodes are inserted.

[0012] The beneficial effects of this utility model are as follows: the clamping ring and the ring cover form a sealing structure, and the heating agent, ignition powder and ignition needle are set inside to isolate the external phase change liquid; the detonating wire is connected to the inner side of the hollow tube of the phase change rock breaking device, and the middle connecting section of the hollow tube is used as a support to connect the excitation device. The excitation device is provided with connecting terminals that are connected to the terminals of the detonating wire, so that the excitation device can be detonated from the outside; the connection terminal is sealed with glue to improve the sealing performance of the excitation device, and at the same time ensure that the excitation device can be stably connected to the hollow tube. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a schematic diagram of a phase change rock breaking device.

[0015] Figure 2 This is a diagram showing the layout of the excitation device in the phase change rock breaking device.

[0016] Figure 3 This is a schematic diagram showing the connection between the hollow rod and the excitation device.

[0017] Figure 4 This is an exploded view of the hollow rod and the excitation device.

[0018] Figure 5It is a cross-sectional view of the hollow rod and the excitation device.

[0019] Figure 6 This is an enlarged view of the floating contact terminal.

[0020] Figure 7 This is a structural diagram of the excitation device.

[0021] Figure 8 This is a schematic diagram of the relevant structure at the ring cover.

[0022] Figure 9 This is a diagram of the internal structure of the ring cover.

[0023] Figure 10 This is a diagram of the ring cover structure.

[0024] Figure 11 This is a schematic diagram of the connection between the conductive ring and the ignition needle.

[0025] In the diagram: 1. Liquid storage; 2. Intermediate connecting section; 201. Upper section; 202. Lower section; 203. Detonator wire connection terminal; 204. Glue filling hole; 3. Activation device; 301. Clamping ring; 302. Floating contact terminal; 304. Glue filling channel; 305. Conductive ring; 306. Terminal retaining spring; 307. Sealing ring sleeve; 308. Connecting wire; 309. Annular sinker; 310. Notched sinker; 311. Terminal hole; 4. Ignition needle; 401. Ignition powder; 402. Exothermic agent; 403. Electrode; 404. Attitude holding frame; 5. Infusion tube; 6. Exhaust pipe; 601. Hollow tube; 7. Bursting hole; 8. Current limiting resistor; 9. Detonator wire; 10. Cover layer; 11. Grounding rod; 1101. Grounding wire; 12. AC power supply; 13. Switching power supply module; 14. Phase change fluid; 15. Drive module; 16. Transformer; 17. Rectifier module; 18. Dewar can; 1801. Tank valve. Detailed Implementation

[0026] like Figure 1-2 In a phase change rock breaking device, a liquid storage 1 is provided in a blast hole 7. A soil cover layer 10 is provided above the liquid storage 1 in the blast hole 7. An ignition device 3 is provided in the liquid storage 1. The ignition device 3 is provided with an ignition needle 4, a igniter 401 and a heating agent 402. The ignition needle 4 includes two adjacent electrodes 403. The electrodes 403 are ignited by an electric current to ignite the igniter 401. The ignition needle 4 is provided with a detonating wire 9 extending out of the blast hole 7. It is also provided with a liquid delivery pipe 5 and an exhaust pipe 6. The lower end of the liquid delivery pipe 5 is inserted into the lower end of the liquid storage 1. The lower end of the exhaust pipe 6 is connected to the upper end of the liquid storage 1. Liquid phase change liquid 14 is injected into the liquid storage 1 through the liquid delivery pipe 5.

[0027] The ignition device 3 contains a heating agent 402, with an igniter 401 mixed in at the top. Electrodes 403 are embedded in or near the igniter 401. The igniter 401 is primarily composed of a mixture of magnesium powder and iron oxide, while the heating agent 402 is mainly a thermite, composed of a mixture of aluminum powder and iron oxide. An electric arc is generated between the two electrodes 403 due to high voltage, igniting the igniter 401. The combustion of the igniter 401 releases a large amount of heat, triggering a chemical reaction in the thermite and generating a large amount of heat, thus activating the phase change liquid 14.

[0028] The liquid storage 1 is expandable. The upper end of the liquid storage 1 is open and an ignition needle 4 is provided at the opening. Multiple ignition powders 401 are provided circumferentially at the lower end of the ignition needle 4, which pre-supports the liquid storage 1 into an approximately cylindrical shape.

[0029] The infusion tube 5 is made of conductive material. One end of the infusion tube 5 extending out of the rupture hole 7 is wrapped with a grounding wire 1101. The end of the grounding wire 1101 is provided with a grounding rod 11, which is inserted into the ground.

[0030] The phase change fluid 14 is liquid oxygen or liquid air and can be stored in a Dewar tank 18. The Dewar tank 18 is equipped with a tank valve 1801 and is connected to the delivery pipe 5 through a liquid oxygen or liquid air pipeline.

[0031] The higher the liquid oxygen content in liquid air, the better it supports combustion during an explosion; liquid oxygen can also be directly introduced.

[0032] After liquid oxygen is filled into the storage liquid 1, due to the rise in external temperature, the pressure inside the rupture hole 7 is much lower than that in the Dewar jar 18, and the liquid oxygen has a tendency to vaporize. Therefore, it is necessary to cover the storage liquid 1 with a certain thickness of soil to provide a closed environment, maintain the low temperature as much as possible, and restrain the vaporization trend.

[0033] Therefore, the construction workers inserted the integrated structure into the blast hole 7 and backfilled the hole opening with soil. One end of the infusion pipe 5 was connected to the liquid oxygen pipe, and the liquid oxygen was pumped into the storage liquid 1. After the storage liquid 1 was full, a small amount of liquid oxygen would be ejected through the exhaust pipe 6, at which point the pumping should be stopped.

[0034] After the personnel evacuated, the triggering device 3 was remotely detonated via the detonating wire 9, causing the remaining liquid phase change liquid 14 to rapidly vaporize. The stored liquid 1 expanded rapidly and acted on the blast hole 7, breaking the rock mass.

[0035] like Figure 3-11An arc excitation device for a phase change rock breaking device includes a detonating wire 9, a hollow tube 601, and an excitation device 3. The hollow tube 601 includes an intermediate connecting section 2. The excitation device 3 is provided with a clamping ring cylinder 301. The clamping ring cylinder 301 has an annular inner cavity, in which a igniter 401 and a heating agent 402 are provided. The opening end of the clamping ring cylinder 301 is provided with a ring cover 302. The outer wall of the intermediate connecting section 2 is provided with a detonating wire connection terminal 203. The lower end of the detonating wire 9 passes through the inner wall of the intermediate connecting section 2 and is connected to the detonating wire connection terminal 203. The inner wall of the ring cover 302 is provided with a floating contact terminal 303. An ignition needle 4 is provided on the side of the ring cover 302 near the clamping ring cylinder 301. The electrode 403 is electrically connected to the floating contact terminal 303. The ring cover 302 is sleeved on the outer wall of the intermediate connecting section 2 so that the detonating wire connection terminal 203 is in contact with the floating contact terminal 303.

[0036] There are two detonator terminals 203 and two floating contact terminals 303.

[0037] The core of the detonator 9 is stripped from the lower end and welded to the detonator connection terminal 203. The detonator connection terminal 203 is inserted into the through hole in the inner wall of the intermediate connecting section 2 and glue is filled to fill the gap and fix it to prevent liquid oxygen or liquid air from leaking out of the pipe through the gap.

[0038] The hollow tube 601 also includes an upper section 201 and a lower section 202. The upper end of the upper section 201 is connected to the exhaust pipe 6. The intermediate connecting section 2 is sandwiched between the upper section 201 and the lower section 202. After the triggering device 3 is sleeved with the intermediate connecting section 2, it is ensured to always be in the middle of the hollow tube 601, that is, in the very center of the inner cavity of the liquid storage 1. The upper end of the detonating wire 9 passes through the upper section 201 and finally reaches the outside of the blast hole 7.

[0039] When the AC power supply 12 is turned on, the switching power supply module (13) converts the AC power into DC power and outputs it to the drive module 15. The drive module 15 inverts the DC power into AC power and outputs it to the transformer 16. After the transformer 16 boosts the voltage, the rectifier module 17 rectifies the AC power into high-voltage DC power and applies it to the ignition needle 4, generating a high-voltage arc discharge.

[0040] In a preferred embodiment, a terminal retaining spring 306 and a sealing ring 307 are sequentially provided on the inner side of the floating contact terminal 303 inside the ring cover 302.

[0041] The side of the floating contact terminal 303 that contacts the detonator wire connection terminal 203 is the outer side, and the other side is the inner side.

[0042] The sealing ring 307 serves as the stop base for the terminal retaining spring 306, allowing the floating contact terminal 303 to float inward or outward, ensuring good contact with the detonating wire connection terminal 203.

[0043] In a preferred embodiment, the ring cover 302 has two concentrically arranged annular recessed grooves 309 on one side, each annular recessed groove 309 having a conductive ring 305. The ring cover 302 also has a notched recessed groove 310, the inner side wall of which has a through terminal hole 311. A floating contact terminal 303, a terminal retaining spring 306, and a sealing ring sleeve 307 are disposed in the terminal hole 311. A connecting wire 308 is also provided, one end of which is connected to the floating contact terminal 303, and the other end of which passes through the sealing ring sleeve 307 to connect with the conductive ring 305. One end of each electrode 403 is connected to the conductive ring 305.

[0044] The inner and outer walls of the sealing ring 307 are bonded to the connecting wire 308 and the terminal hole 311 with glue, which serves to fix and seal the connection. Since the core of the connecting wire 308 is generally made of multi-strand fine copper wire, it has a certain degree of flexibility and does not affect the floating and retracting of the floating contact terminal 303. Furthermore, the limited length of the connecting wire 308 ensures that the floating contact terminal 303 will not be pushed out of the terminal hole 311.

[0045] The ignition needle 4 includes an H-shaped attitude retainer 404. Two electrodes 403 are respectively inserted into the through holes on the two long sides of the H-shaped attitude retainer 404 and protrude from the other end. One electrode is inserted into the connection hole of the outer conductive ring 305, and the other attitude retainer 404 is inserted into the connection hole of the inner conductive ring 305. The concentric ring formed by the two conductive rings 305 has multiple sets of parallel ignition needles 4 along the circumference to ensure synchronous ignition of the ignition powder 401 at each position in the annular cavity of the clamping cavity ring cylinder 301. The discharge end of the electrode 403 is a sharp angle and bends inward to approach each other, which facilitates the ignition of the electric arc.

[0046] In the preferred embodiment, the ring cover 302 is provided with two glue-filling channels 304 near the inner wall, the outer wall of the intermediate connecting section 2 is provided with a sinking part, the detonator connection terminal 203 is provided in the sinking part, the side wall of the sinking part is provided with two glue-filling holes 204, and the intermediate connecting section 2 is sleeved with the ring cover 302 so that the glue-filling channels 304 and the glue-filling holes 204 are closed and connected to the sinking part.

[0047] After the excitation device 3 is sleeved with the intermediate connecting section 2 and the terminals make contact, the glue-filling hole 204 and the glue-filling channel 304 combine to form a complete channel. Glue is poured in from one channel and stops when it overflows from the other channel, filling the gap and preventing liquid oxygen or liquid air from seeping into the inner cavity of the clamping ring cylinder 301. After the glue solidifies in the settling tank, the excitation device 3 and the intermediate connecting section 2 are bonded together.

[0048] In the preferred embodiment, an AC power supply 12, a switching power supply module 13, a drive module 15, a transformer 16, and a rectifier module 17 are electrically connected. The two ends of the detonating wire 9 are connected to the rectifier module 17 and the ignition needle 4, respectively, and a current-limiting resistor 8 is connected in series on the detonating wire 9.

[0049] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. An arc excitation device for a phase change rock breaking device, characterized in that: The device includes a detonating wire (9), a hollow tube (601), and an ignition device (3). The hollow tube (601) includes an intermediate connecting section (2). The ignition device (3) is provided with a clamping ring cylinder (301). The clamping ring cylinder (301) has an annular inner cavity, in which a igniter (401) and a heating agent (402) are provided. The opening end of the clamping ring cylinder (301) is provided with an annular cap (302). The outer wall of the intermediate connecting section (2) is provided with a detonating wire connection terminal (203). The lower end of the detonating wire (9) passes through the intermediate connecting section. (2) The inner wall is connected to the detonation wire connection terminal (203). The inner wall of the ring cover (302) is provided with a floating contact terminal (303). The ring cover (302) is provided with an ignition needle (4) on the side of the ring cover (302) near the clamping ring cylinder (301). The ignition needle (4) is provided with two adjacent electrodes (403). The electrodes (403) are electrically connected to the floating contact terminal (303). The ring cover (302) is sleeved on the outer wall of the intermediate connecting section (2) so that the detonation wire connection terminal (203) contacts the floating contact terminal (303).

2. The arc excitation device for a phase change rock-breaking device according to claim 1, characterized in that: The inner side of the floating contact terminal (303) inside the ring cover (302) is provided with a terminal retaining spring (306) and a sealing ring sleeve (307).

3. The arc excitation device for a phase change rock-breaking device according to claim 2, characterized in that: The ring cover (302) has two concentrically arranged annular recessed grooves (309) on one side, and each annular recessed groove (309) has a conductive ring (305). The ring cover (302) also has a notched recessed groove (310). The inner side wall of the notched recessed groove (310) has a through terminal hole (311). The floating contact terminal (303), the terminal retaining spring (306) and the sealing ring (307) are arranged in the terminal hole (311). A connecting wire (308) is also provided. One end of the connecting wire (308) is connected to the floating contact terminal (303), and the other end of the connecting wire (308) passes through the sealing ring (307) to connect with the conductive ring (305). One end of each electrode (403) is connected to the conductive ring (305).

4. The arc excitation device for a phase change rock-breaking device according to claim 1, characterized in that: The ring cover (302) has two glue-filling channels (304) near the inner wall. The outer wall of the middle connecting section (2) has a sinking part. The detonation wire connection terminal (203) is located in the sinking part. The side wall of the sinking part has two glue-filling holes (204). The middle connecting section (2) is sleeved with the ring cover (302) so that the glue-filling channels (304) and the glue-filling holes (204) are closed and connected to the sinking part.

5. The arc excitation device for a phase change rock-breaking device according to claim 1, characterized in that: It is also equipped with an AC power supply (12), a switching power supply module (13), a drive module (15), a transformer (16) and a rectifier module (17) with electrical connections. The two ends of the detonating wire (9) are connected to the rectifier module (17) and the ignition needle (4) respectively.

6. The arc excitation device for a phase change rock-breaking device according to claim 5, characterized in that: A current-limiting resistor (8) is connected in series on the detonating wire (9).

7. The arc excitation device for a phase change rock-breaking device according to claim 1, characterized in that: The ignition needle (4) also includes an H-shaped attitude retainer (404), in which two electrodes (403) are inserted.

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